We now offer DoD-sponsored security devices for FPGAs in the form of a Physically Uncloneable Function (PUF). Each PUF is identical to others, but because of subtle process variations the output of each is independent. A unique n-bit identifier results by replicating n PUFs on the FPGA. Each PUF is extremely compact since it fits in a single CLB.

Each FPGA will have a unique PUF signature, allowing a FPGA to be uniquely identified and distinguished from other "identical" FPGAs.

A PUF can be also be used for traditional challenge-response queries. In addition a PUF can form a seed for public-private key infrastructure, where the private key never leaves the FPGA.